The only way I know how to do row count is to use Scan. If you want additional
optimization, try FirstKeyOnlyFilter (see its API JavaDoc).
Here is an example:
final Scan sizeScan = new Scan().setFilter(new FirstKeyOnlyFilter());
final ResultScanner scanner = htable.getScanner(sizeScan);
try {
Actual row count is not stored anywhere. It must be discovered by a table scan,
or
a distributed count (mapreduce job, usually).
- Andy
- Original Message
> From: john smith
> To: hbase-user@hadoop.apache.org
> Sent: Thu, January 28, 2010 2:44:16 PM
> Subject: Re: Tab
I think META table stores some info about tables .. is it not the case?
On Thu, Jan 28, 2010 at 12:10 PM, Dan Washusen wrote:
> I think the shell just performs a scan and iterates over all the rows,
> counting as it goes. You could do the same with the client API...
>
> 2010/1/28 john smith
>
I think the shell just performs a scan and iterates over all the rows,
counting as it goes. You could do the same with the client API...
2010/1/28 john smith
> Hi guys,
>
> Is there a way to get the rowcount of the table from java API .. I looked
> at
> HTable and HTableDesc... but I couldn't f
Hi guys,
Is there a way to get the rowcount of the table from java API .. I looked at
HTable and HTableDesc... but I couldn't find it .. It is similar to "count
" frm Hbase shell.
Thanks
J-S
